Knife support for axminster looms



NOV. 20, 195] J, H, PFAU 2,575,834

KNIFE SUPPORT FOR AXMINSTER LOOMS Filed Feb. 28. 1950 2 24 i /7 2 INVENTOR.

Patented Nov. 20, 1951 .OFFICE Julius 1H. Pfaugiyonkers, N. Y.,sassgnor LtcAlexander Smith, Incorporated, .arf corporation.4 .of

New York Application February 28, 1950;- Serial No; 146,865

This invention relates generally to carpet looms of *the Axminster type. 'More specically the Ainvention relates tothemanner of attaching the knives t'o the rknife bars onbeams.

In Axrninster `.looms the yarn-'is fed` from fa plurality z of spools arranged inzarow and fis 1inserted in the backing material, after which the yarn is cut from the spools by a pair of cooperating knives which extend across the width of the loom. These knives must be kept in accurate alignment and register to produce a uniform pile. In the relatively Wide Axminster looms in generaluse today it is necessary to provide very stiff and rigid beams or bars for carrying the knives. If the beams are very limber any vibration Will separate the knives so that complete cutting across the loom will not be obtained. On the other hand, it has been found that with the knives rigidly secured to stiiT, heavy beams any vibration is likely to break the knife blades.

According to my invention I provide a flexible mounting for securing a knife blade to a stiff, heavy, rigid beam which eliminates all danger of blade breakage due to vibration of the beam and permits the loom to operate at a much higher speed than was previously possible.

The principal object of my invention is to provide a knife blade mounting which will eliminate all danger of blade breakage due to vibration.

Another object of the invention is to provide a knife blade mounting which will assure more accurate cutting and thereby produce a more uniform pile.

Still another object of the invention is to provide a knife blade mounting for Axminster carpet looms which is so constructed and arranged as to permit a higher operating speed than was previously possible.

Other and more limited. objects of the invention will be apparent from the following specication and the accompanying drawings forming a part thereof wherein:

Fig. l is a fragmentary transverse section through a portion of an Axminster carpet loom showing my invention incorporated therein;

Fig. 2 is a plan view of the back beam removed from the loom and showing a knife blade secured thereto according to my invention; and

Fig. 3 is a vertical sectional view taken on the line 3--3 of Fig. 2.

Referring to the drawings by reference characters, the muneral I indicates a portion of one of the side frames of an Axminster carpet loom. A reed or comb 2 is suitably supported by a lay 3 which is mounted for forward and backward '25cm-Img. (c1. 13s-v) movement Aupon armsf. tube frame 5,` carryin'gwspoolsv, :is4 secured `to actuating levers 1. The parts thus fardescribed and the operating mechanism therefor are of standard'well known construction andfformno part of my invention.

Consequently :they are notshown; and described in more detail herein.

A back beam I0 is slidably mounted at the ends thereof in the usual guide-ways or blocks II which are secured to the side frames of the loom. The beam I0 is reciprocated in the guideways II by standard mechanism, not shown, through connecting rods I2. A front beam I3 is mounted for rocking movement upon the upper ends of pivoted levers I4. A knife blade I5 is rigidly secured to the under-side of the front bar I3 by a plurality of bolts i6.

The back beam I0 comprises the base I'I and the flange I8 which is integral with the base I'I and extends upwardly from the rear edge thereof. The ends I9 of the base I1 beyond the ends of the flange I8 extend into the guide-Ways I I.

A knife blade 22 which cooperates with the blade I5 is rigidly secured by a plurality of bolts 23 to the underside of a blade holder 24. The blade holder 24 is pivotally secured to the underside of the base I1 of the back beam I0 by a piano hinge 25 which extends the full length of the blade holder 24 intermediate the side edges thereof. A plurality of equally spaced studs 28 are rigidly secured to the blade holder 24 in a row adjacent the rear edge thereof. The studs 26 extend upwardly, from the blade holder 24, through apertures 2l in the base I1 of the rear beam I0 and into elongated apertures 28 in the bottom leg of an angle iron 29 which is secured to and extends the length of the iiange I8 of the back beam In. Each stud 2E has a nut 30 and a washer 3| adjustably mounted thereon. A tubular section of sponge rubber 32 is disposed about each stud 26 between the washer 3l and the underside of the bottom leg of the angle iron 29. The sponge rubber sections 32 acting through the studs 26 and blade holder 24 resiliently hold the knife blade 22 in proper position with respect to the knife blade I5. The normal position of the blade 22 can be accurately adjusted by the nuts 30, If desired soft springs may be substituted for the sponge rubber sections 32.

With this construction and arrangement I am able to use stiff rigid beams Without danger of breaking or separating the knife blades by vibration during operation. This principle of stiff support with local flexibility of the blade enables a loom to be operated at much higher speeds than was previously possible.

While I have shown and described my improved blade mounting as applied to the back beam of a loom, it will be obvious to those skilled in this art that it can be applied equally well to the front beam; and it is to be understood that I am not limited to the specific construction shown and described as various modications may be made therein within the spirit of the invention.

What is claimed is:

1. In a knife blade mounting for an Axminster carpet loom the combination of aknife beam having a base andan outwardly extending ange, a knife blade holder, a hinge by which said holder is secured to the underside of said base, a knife blade rigidly secured to said holder at-one side of said hinge, a plurality of studs rigidly secured l Y to said holder at the other side of saidfhinge,-

having a base and an outwardly extending flange. a knife blade holder, a hinge by which said holder is secured to the underside of said base, a knife blade rigidly secured to said holder at one side of said hinge, a plurality of studs rigidly secured to said holder at the other side of said hinge, said studs extending upwardly through apertures in saidbase and into apertures'inan angle bracket secured to said flange, an adjustable'stop on each of said studs, and resilient means mounted on each of said stubs between said adjustable stops and said bracket, said resilient means being operable to maintain said holder and said knifeI blade in normal position.

' JULIUS H. PFAU.,

,Y REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Palmer July 3, 1945 

